b8d14f88f0b53bec64e81164538d605d7653ef48
[sfrench/cifs-2.6.git] / drivers / watchdog / pcwd_pci.c
1 /*
2  *      Berkshire PCI-PC Watchdog Card Driver
3  *
4  *      (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
5  *
6  *      Based on source code of the following authors:
7  *        Ken Hollis <kenji@bitgate.com>,
8  *        Lindsay Harris <lindsay@bluegum.com>,
9  *        Alan Cox <alan@lxorguk.ukuu.org.uk>,
10  *        Matt Domsch <Matt_Domsch@dell.com>,
11  *        Rob Radez <rob@osinvestor.com>
12  *
13  *      This program is free software; you can redistribute it and/or
14  *      modify it under the terms of the GNU General Public License
15  *      as published by the Free Software Foundation; either version
16  *      2 of the License, or (at your option) any later version.
17  *
18  *      Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
19  *      provide warranty for any of this software. This material is
20  *      provided "AS-IS" and at no charge.
21  */
22
23 /*
24  *      A bells and whistles driver is available from:
25  *      http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
26  *
27  *      More info available at
28  *      http://www.berkprod.com/ or http://www.pcwatchdog.com/
29  */
30
31 /*
32  *      Includes, defines, variables, module parameters, ...
33  */
34
35 #include <linux/module.h>       /* For module specific items */
36 #include <linux/moduleparam.h>  /* For new moduleparam's */
37 #include <linux/types.h>        /* For standard types (like size_t) */
38 #include <linux/errno.h>        /* For the -ENODEV/... values */
39 #include <linux/kernel.h>       /* For printk/panic/... */
40 #include <linux/delay.h>        /* For mdelay function */
41 #include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
42 #include <linux/watchdog.h>     /* For the watchdog specific items */
43 #include <linux/notifier.h>     /* For notifier support */
44 #include <linux/reboot.h>       /* For reboot_notifier stuff */
45 #include <linux/init.h>         /* For __init/__exit/... */
46 #include <linux/fs.h>           /* For file operations */
47 #include <linux/pci.h>          /* For pci functions */
48 #include <linux/ioport.h>       /* For io-port access */
49 #include <linux/spinlock.h>     /* For spin_lock/spin_unlock/... */
50 #include <linux/uaccess.h>      /* For copy_to_user/put_user/... */
51 #include <linux/io.h>           /* For inb/outb/... */
52
53 /* Module and version information */
54 #define WATCHDOG_VERSION "1.03"
55 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
56 #define WATCHDOG_NAME "pcwd_pci"
57 #define PFX WATCHDOG_NAME ": "
58 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n"
59
60 /* Stuff for the PCI ID's  */
61 #ifndef PCI_VENDOR_ID_QUICKLOGIC
62 #define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
63 #endif
64
65 #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
66 #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
67 #endif
68
69 /*
70  * These are the defines that describe the control status bits for the
71  * PCI-PC Watchdog card.
72  */
73 /* Port 1 : Control Status #1 */
74 #define WD_PCI_WTRP             0x01    /* Watchdog Trip status */
75 #define WD_PCI_HRBT             0x02    /* Watchdog Heartbeat */
76 #define WD_PCI_TTRP             0x04    /* Temperature Trip status */
77 #define WD_PCI_RL2A             0x08    /* Relay 2 Active */
78 #define WD_PCI_RL1A             0x10    /* Relay 1 Active */
79 #define WD_PCI_R2DS             0x40    /* Relay 2 Disable Temperature-trip /
80                                                                         reset */
81 #define WD_PCI_RLY2             0x80    /* Activate Relay 2 on the board */
82 /* Port 2 : Control Status #2 */
83 #define WD_PCI_WDIS             0x10    /* Watchdog Disable */
84 #define WD_PCI_ENTP             0x20    /* Enable Temperature Trip Reset */
85 #define WD_PCI_WRSP             0x40    /* Watchdog wrote response */
86 #define WD_PCI_PCMD             0x80    /* PC has sent command */
87
88 /* according to documentation max. time to process a command for the pci
89  * watchdog card is 100 ms, so we give it 150 ms to do it's job */
90 #define PCI_COMMAND_TIMEOUT     150
91
92 /* Watchdog's internal commands */
93 #define CMD_GET_STATUS                          0x04
94 #define CMD_GET_FIRMWARE_VERSION                0x08
95 #define CMD_READ_WATCHDOG_TIMEOUT               0x18
96 #define CMD_WRITE_WATCHDOG_TIMEOUT              0x19
97 #define CMD_GET_CLEAR_RESET_COUNT               0x84
98
99 /* Watchdog's Dip Switch heartbeat values */
100 static const int heartbeat_tbl[] = {
101         5,      /* OFF-OFF-OFF  =  5 Sec  */
102         10,     /* OFF-OFF-ON   = 10 Sec  */
103         30,     /* OFF-ON-OFF   = 30 Sec  */
104         60,     /* OFF-ON-ON    =  1 Min  */
105         300,    /* ON-OFF-OFF   =  5 Min  */
106         600,    /* ON-OFF-ON    = 10 Min  */
107         1800,   /* ON-ON-OFF    = 30 Min  */
108         3600,   /* ON-ON-ON     =  1 hour */
109 };
110
111 /* We can only use 1 card due to the /dev/watchdog restriction */
112 static int cards_found;
113
114 /* internal variables */
115 static int temp_panic;
116 static unsigned long is_active;
117 static char expect_release;
118 /* this is private data for each PCI-PC watchdog card */
119 static struct {
120         /* Wether or not the card has a temperature device */
121         int supports_temp;
122         /* The card's boot status */
123         int boot_status;
124         /* The cards I/O address */
125         unsigned long io_addr;
126         /* the lock for io operations */
127         spinlock_t io_lock;
128         /* the PCI-device */
129         struct pci_dev *pdev;
130 } pcipcwd_private;
131
132 /* module parameters */
133 #define QUIET   0       /* Default */
134 #define VERBOSE 1       /* Verbose */
135 #define DEBUG   2       /* print fancy stuff too */
136 static int debug = QUIET;
137 module_param(debug, int, 0);
138 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
139
140 #define WATCHDOG_HEARTBEAT 0    /* default heartbeat =
141                                                 delay-time from dip-switches */
142 static int heartbeat = WATCHDOG_HEARTBEAT;
143 module_param(heartbeat, int, 0);
144 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
145         "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
146                                 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
147
148 static int nowayout = WATCHDOG_NOWAYOUT;
149 module_param(nowayout, int, 0);
150 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
151                                         __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
152
153 /*
154  *      Internal functions
155  */
156
157 static int send_command(int cmd, int *msb, int *lsb)
158 {
159         int got_response, count;
160
161         if (debug >= DEBUG)
162                 printk(KERN_DEBUG PFX "sending following data "
163                 "cmd=0x%02x msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb);
164
165         spin_lock(&pcipcwd_private.io_lock);
166         /* If a command requires data it should be written first.
167          * Data for commands with 8 bits of data should be written to port 4.
168          * Commands with 16 bits of data, should be written as LSB to port 4
169          * and MSB to port 5.
170          * After the required data has been written then write the command to
171          * port 6. */
172         outb_p(*lsb, pcipcwd_private.io_addr + 4);
173         outb_p(*msb, pcipcwd_private.io_addr + 5);
174         outb_p(cmd, pcipcwd_private.io_addr + 6);
175
176         /* wait till the pci card processed the command, signaled by
177          * the WRSP bit in port 2 and give it a max. timeout of
178          * PCI_COMMAND_TIMEOUT to process */
179         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
180         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
181                                                                 count++) {
182                 mdelay(1);
183                 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
184         }
185
186         if (debug >= DEBUG) {
187                 if (got_response) {
188                         printk(KERN_DEBUG PFX
189                                 "time to process command was: %d ms\n",
190                                 count);
191                 } else {
192                         printk(KERN_DEBUG PFX
193                                 "card did not respond on command!\n");
194                 }
195         }
196
197         if (got_response) {
198                 /* read back response */
199                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
200                 *msb = inb_p(pcipcwd_private.io_addr + 5);
201
202                 /* clear WRSP bit */
203                 inb_p(pcipcwd_private.io_addr + 6);
204
205                 if (debug >= DEBUG)
206                         printk(KERN_DEBUG PFX "received following data for "
207                                 "cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
208                                 cmd, *msb, *lsb);
209         }
210
211         spin_unlock(&pcipcwd_private.io_lock);
212
213         return got_response;
214 }
215
216 static inline void pcipcwd_check_temperature_support(void)
217 {
218         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
219                 pcipcwd_private.supports_temp = 1;
220 }
221
222 static int pcipcwd_get_option_switches(void)
223 {
224         int option_switches;
225
226         option_switches = inb_p(pcipcwd_private.io_addr + 3);
227         return option_switches;
228 }
229
230 static void pcipcwd_show_card_info(void)
231 {
232         int got_fw_rev, fw_rev_major, fw_rev_minor;
233         char fw_ver_str[20];            /* The cards firmware version */
234         int option_switches;
235
236         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
237                                                                 &fw_rev_minor);
238         if (got_fw_rev)
239                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
240         else
241                 sprintf(fw_ver_str, "<card no answer>");
242
243         /* Get switch settings */
244         option_switches = pcipcwd_get_option_switches();
245
246         printk(KERN_INFO PFX "Found card at port "
247                 "0x%04x (Firmware: %s) %s temp option\n",
248                 (int) pcipcwd_private.io_addr, fw_ver_str,
249                 (pcipcwd_private.supports_temp ? "with" : "without"));
250
251         printk(KERN_INFO PFX "Option switches (0x%02x): "
252                 "Temperature Reset Enable=%s, Power On Delay=%s\n",
253                 option_switches,
254                 ((option_switches & 0x10) ? "ON" : "OFF"),
255                 ((option_switches & 0x08) ? "ON" : "OFF"));
256
257         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
258                 printk(KERN_INFO PFX
259                         "Previous reset was caused by the Watchdog card\n");
260
261         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
262                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
263
264         if (pcipcwd_private.boot_status == 0)
265                 printk(KERN_INFO PFX
266                         "No previous trip detected - Cold boot or reset\n");
267 }
268
269 static int pcipcwd_start(void)
270 {
271         int stat_reg;
272
273         spin_lock(&pcipcwd_private.io_lock);
274         outb_p(0x00, pcipcwd_private.io_addr + 3);
275         udelay(1000);
276
277         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
278         spin_unlock(&pcipcwd_private.io_lock);
279
280         if (stat_reg & WD_PCI_WDIS) {
281                 printk(KERN_ERR PFX "Card timer not enabled\n");
282                 return -1;
283         }
284
285         if (debug >= VERBOSE)
286                 printk(KERN_DEBUG PFX "Watchdog started\n");
287
288         return 0;
289 }
290
291 static int pcipcwd_stop(void)
292 {
293         int stat_reg;
294
295         spin_lock(&pcipcwd_private.io_lock);
296         outb_p(0xA5, pcipcwd_private.io_addr + 3);
297         udelay(1000);
298
299         outb_p(0xA5, pcipcwd_private.io_addr + 3);
300         udelay(1000);
301
302         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
303         spin_unlock(&pcipcwd_private.io_lock);
304
305         if (!(stat_reg & WD_PCI_WDIS)) {
306                 printk(KERN_ERR PFX
307                         "Card did not acknowledge disable attempt\n");
308                 return -1;
309         }
310
311         if (debug >= VERBOSE)
312                 printk(KERN_DEBUG PFX "Watchdog stopped\n");
313
314         return 0;
315 }
316
317 static int pcipcwd_keepalive(void)
318 {
319         /* Re-trigger watchdog by writing to port 0 */
320         spin_lock(&pcipcwd_private.io_lock);
321         outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
322         spin_unlock(&pcipcwd_private.io_lock);
323
324         if (debug >= DEBUG)
325                 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
326
327         return 0;
328 }
329
330 static int pcipcwd_set_heartbeat(int t)
331 {
332         int t_msb = t / 256;
333         int t_lsb = t % 256;
334
335         if ((t < 0x0001) || (t > 0xFFFF))
336                 return -EINVAL;
337
338         /* Write new heartbeat to watchdog */
339         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
340
341         heartbeat = t;
342         if (debug >= VERBOSE)
343                 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
344                        heartbeat);
345
346         return 0;
347 }
348
349 static int pcipcwd_get_status(int *status)
350 {
351         int control_status;
352
353         *status = 0;
354         control_status = inb_p(pcipcwd_private.io_addr + 1);
355         if (control_status & WD_PCI_WTRP)
356                 *status |= WDIOF_CARDRESET;
357         if (control_status & WD_PCI_TTRP) {
358                 *status |= WDIOF_OVERHEAT;
359                 if (temp_panic)
360                         panic(PFX "Temperature overheat trip!\n");
361         }
362
363         if (debug >= DEBUG)
364                 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
365                        control_status);
366
367         return 0;
368 }
369
370 static int pcipcwd_clear_status(void)
371 {
372         int control_status;
373         int msb;
374         int reset_counter;
375
376         if (debug >= VERBOSE)
377                 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
378
379         control_status = inb_p(pcipcwd_private.io_addr + 1);
380
381         if (debug >= DEBUG) {
382                 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
383                 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
384                        (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
385         }
386
387         /* clear trip status & LED and keep mode of relay 2 */
388         outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
389                                                 pcipcwd_private.io_addr + 1);
390
391         /* clear reset counter */
392         msb = 0;
393         reset_counter = 0xff;
394         send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
395
396         if (debug >= DEBUG) {
397                 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
398                        reset_counter);
399         }
400
401         return 0;
402 }
403
404 static int pcipcwd_get_temperature(int *temperature)
405 {
406         *temperature = 0;
407         if (!pcipcwd_private.supports_temp)
408                 return -ENODEV;
409
410         spin_lock(&pcipcwd_private.io_lock);
411         *temperature = inb_p(pcipcwd_private.io_addr);
412         spin_unlock(&pcipcwd_private.io_lock);
413
414         /*
415          * Convert celsius to fahrenheit, since this was
416          * the decided 'standard' for this return value.
417          */
418         *temperature = (*temperature * 9 / 5) + 32;
419
420         if (debug >= DEBUG) {
421                 printk(KERN_DEBUG PFX "temperature is: %d F\n",
422                        *temperature);
423         }
424
425         return 0;
426 }
427
428 static int pcipcwd_get_timeleft(int *time_left)
429 {
430         int msb;
431         int lsb;
432
433         /* Read the time that's left before rebooting */
434         /* Note: if the board is not yet armed then we will read 0xFFFF */
435         send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
436
437         *time_left = (msb << 8) + lsb;
438
439         if (debug >= VERBOSE)
440                 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
441                        *time_left);
442
443         return 0;
444 }
445
446 /*
447  *      /dev/watchdog handling
448  */
449
450 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
451                              size_t len, loff_t *ppos)
452 {
453         /* See if we got the magic character 'V' and reload the timer */
454         if (len) {
455                 if (!nowayout) {
456                         size_t i;
457
458                         /* note: just in case someone wrote the magic character
459                          * five months ago... */
460                         expect_release = 0;
461
462                         /* scan to see whether or not we got the
463                          * magic character */
464                         for (i = 0; i != len; i++) {
465                                 char c;
466                                 if (get_user(c, data + i))
467                                         return -EFAULT;
468                                 if (c == 'V')
469                                         expect_release = 42;
470                         }
471                 }
472
473                 /* someone wrote to us, we should reload the timer */
474                 pcipcwd_keepalive();
475         }
476         return len;
477 }
478
479 static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
480                                                 unsigned long arg)
481 {
482         void __user *argp = (void __user *)arg;
483         int __user *p = argp;
484         static const struct watchdog_info ident = {
485                 .options =              WDIOF_OVERHEAT |
486                                         WDIOF_CARDRESET |
487                                         WDIOF_KEEPALIVEPING |
488                                         WDIOF_SETTIMEOUT |
489                                         WDIOF_MAGICCLOSE,
490                 .firmware_version =     1,
491                 .identity =             WATCHDOG_DRIVER_NAME,
492         };
493
494         switch (cmd) {
495         case WDIOC_GETSUPPORT:
496                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
497
498         case WDIOC_GETSTATUS:
499         {
500                 int status;
501                 pcipcwd_get_status(&status);
502                 return put_user(status, p);
503         }
504
505         case WDIOC_GETBOOTSTATUS:
506                 return put_user(pcipcwd_private.boot_status, p);
507
508         case WDIOC_GETTEMP:
509         {
510                 int temperature;
511
512                 if (pcipcwd_get_temperature(&temperature))
513                         return -EFAULT;
514
515                 return put_user(temperature, p);
516         }
517
518         case WDIOC_SETOPTIONS:
519         {
520                 int new_options, retval = -EINVAL;
521
522                 if (get_user(new_options, p))
523                         return -EFAULT;
524
525                 if (new_options & WDIOS_DISABLECARD) {
526                         if (pcipcwd_stop())
527                                 return -EIO;
528                         retval = 0;
529                 }
530
531                 if (new_options & WDIOS_ENABLECARD) {
532                         if (pcipcwd_start())
533                                 return -EIO;
534                         retval = 0;
535                 }
536
537                 if (new_options & WDIOS_TEMPPANIC) {
538                         temp_panic = 1;
539                         retval = 0;
540                 }
541
542                 return retval;
543         }
544
545         case WDIOC_KEEPALIVE:
546                 pcipcwd_keepalive();
547                 return 0;
548
549         case WDIOC_SETTIMEOUT:
550         {
551                 int new_heartbeat;
552
553                 if (get_user(new_heartbeat, p))
554                         return -EFAULT;
555
556                 if (pcipcwd_set_heartbeat(new_heartbeat))
557                         return -EINVAL;
558
559                 pcipcwd_keepalive();
560                 /* Fall */
561         }
562
563         case WDIOC_GETTIMEOUT:
564                 return put_user(heartbeat, p);
565
566         case WDIOC_GETTIMELEFT:
567         {
568                 int time_left;
569
570                 if (pcipcwd_get_timeleft(&time_left))
571                         return -EFAULT;
572
573                 return put_user(time_left, p);
574         }
575
576         default:
577                 return -ENOTTY;
578         }
579 }
580
581 static int pcipcwd_open(struct inode *inode, struct file *file)
582 {
583         /* /dev/watchdog can only be opened once */
584         if (test_and_set_bit(0, &is_active)) {
585                 if (debug >= VERBOSE)
586                         printk(KERN_ERR PFX
587                                 "Attempt to open already opened device.\n");
588                 return -EBUSY;
589         }
590
591         /* Activate */
592         pcipcwd_start();
593         pcipcwd_keepalive();
594         return nonseekable_open(inode, file);
595 }
596
597 static int pcipcwd_release(struct inode *inode, struct file *file)
598 {
599         /*
600          *      Shut off the timer.
601          */
602         if (expect_release == 42) {
603                 pcipcwd_stop();
604         } else {
605                 printk(KERN_CRIT PFX
606                         "Unexpected close, not stopping watchdog!\n");
607                 pcipcwd_keepalive();
608         }
609         expect_release = 0;
610         clear_bit(0, &is_active);
611         return 0;
612 }
613
614 /*
615  *      /dev/temperature handling
616  */
617
618 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
619                                 size_t len, loff_t *ppos)
620 {
621         int temperature;
622
623         if (pcipcwd_get_temperature(&temperature))
624                 return -EFAULT;
625
626         if (copy_to_user(data, &temperature, 1))
627                 return -EFAULT;
628
629         return 1;
630 }
631
632 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
633 {
634         if (!pcipcwd_private.supports_temp)
635                 return -ENODEV;
636
637         return nonseekable_open(inode, file);
638 }
639
640 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
641 {
642         return 0;
643 }
644
645 /*
646  *      Notify system
647  */
648
649 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
650                                                                 void *unused)
651 {
652         if (code == SYS_DOWN || code == SYS_HALT)
653                 pcipcwd_stop(); /* Turn the WDT off */
654
655         return NOTIFY_DONE;
656 }
657
658 /*
659  *      Kernel Interfaces
660  */
661
662 static const struct file_operations pcipcwd_fops = {
663         .owner =        THIS_MODULE,
664         .llseek =       no_llseek,
665         .write =        pcipcwd_write,
666         .unlocked_ioctl = pcipcwd_ioctl,
667         .open =         pcipcwd_open,
668         .release =      pcipcwd_release,
669 };
670
671 static struct miscdevice pcipcwd_miscdev = {
672         .minor =        WATCHDOG_MINOR,
673         .name =         "watchdog",
674         .fops =         &pcipcwd_fops,
675 };
676
677 static const struct file_operations pcipcwd_temp_fops = {
678         .owner =        THIS_MODULE,
679         .llseek =       no_llseek,
680         .read =         pcipcwd_temp_read,
681         .open =         pcipcwd_temp_open,
682         .release =      pcipcwd_temp_release,
683 };
684
685 static struct miscdevice pcipcwd_temp_miscdev = {
686         .minor =        TEMP_MINOR,
687         .name =         "temperature",
688         .fops =         &pcipcwd_temp_fops,
689 };
690
691 static struct notifier_block pcipcwd_notifier = {
692         .notifier_call =        pcipcwd_notify_sys,
693 };
694
695 /*
696  *      Init & exit routines
697  */
698
699 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
700                 const struct pci_device_id *ent)
701 {
702         int ret = -EIO;
703
704         cards_found++;
705         if (cards_found == 1)
706                 printk(KERN_INFO PFX DRIVER_VERSION);
707
708         if (cards_found > 1) {
709                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
710                 return -ENODEV;
711         }
712
713         if (pci_enable_device(pdev)) {
714                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
715                 return -ENODEV;
716         }
717
718         if (pci_resource_start(pdev, 0) == 0x0000) {
719                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
720                 ret = -ENODEV;
721                 goto err_out_disable_device;
722         }
723
724         pcipcwd_private.pdev = pdev;
725         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
726
727         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
728                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
729                         (int) pcipcwd_private.io_addr);
730                 ret = -EIO;
731                 goto err_out_disable_device;
732         }
733
734         /* get the boot_status */
735         pcipcwd_get_status(&pcipcwd_private.boot_status);
736
737         /* clear the "card caused reboot" flag */
738         pcipcwd_clear_status();
739
740         /* disable card */
741         pcipcwd_stop();
742
743         /* Check whether or not the card supports the temperature device */
744         pcipcwd_check_temperature_support();
745
746         /* Show info about the card itself */
747         pcipcwd_show_card_info();
748
749         /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
750         if (heartbeat == 0)
751                 heartbeat =
752                         heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
753
754         /* Check that the heartbeat value is within it's range ;
755          * if not reset to the default */
756         if (pcipcwd_set_heartbeat(heartbeat)) {
757                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
758                 printk(KERN_INFO PFX
759                         "heartbeat value must be 0<heartbeat<65536, using %d\n",
760                         WATCHDOG_HEARTBEAT);
761         }
762
763         ret = register_reboot_notifier(&pcipcwd_notifier);
764         if (ret != 0) {
765                 printk(KERN_ERR PFX
766                         "cannot register reboot notifier (err=%d)\n", ret);
767                 goto err_out_release_region;
768         }
769
770         if (pcipcwd_private.supports_temp) {
771                 ret = misc_register(&pcipcwd_temp_miscdev);
772                 if (ret != 0) {
773                         printk(KERN_ERR PFX "cannot register miscdev on "
774                                 "minor=%d (err=%d)\n", TEMP_MINOR, ret);
775                         goto err_out_unregister_reboot;
776                 }
777         }
778
779         ret = misc_register(&pcipcwd_miscdev);
780         if (ret != 0) {
781                 printk(KERN_ERR PFX
782                         "cannot register miscdev on minor=%d (err=%d)\n",
783                         WATCHDOG_MINOR, ret);
784                 goto err_out_misc_deregister;
785         }
786
787         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
788                 heartbeat, nowayout);
789
790         return 0;
791
792 err_out_misc_deregister:
793         if (pcipcwd_private.supports_temp)
794                 misc_deregister(&pcipcwd_temp_miscdev);
795 err_out_unregister_reboot:
796         unregister_reboot_notifier(&pcipcwd_notifier);
797 err_out_release_region:
798         pci_release_regions(pdev);
799 err_out_disable_device:
800         pci_disable_device(pdev);
801         return ret;
802 }
803
804 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
805 {
806         /* Stop the timer before we leave */
807         if (!nowayout)
808                 pcipcwd_stop();
809
810         /* Deregister */
811         misc_deregister(&pcipcwd_miscdev);
812         if (pcipcwd_private.supports_temp)
813                 misc_deregister(&pcipcwd_temp_miscdev);
814         unregister_reboot_notifier(&pcipcwd_notifier);
815         pci_release_regions(pdev);
816         pci_disable_device(pdev);
817         cards_found--;
818 }
819
820 static DEFINE_PCI_DEVICE_TABLE(pcipcwd_pci_tbl) = {
821         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
822                 PCI_ANY_ID, PCI_ANY_ID, },
823         { 0 },                  /* End of list */
824 };
825 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
826
827 static struct pci_driver pcipcwd_driver = {
828         .name           = WATCHDOG_NAME,
829         .id_table       = pcipcwd_pci_tbl,
830         .probe          = pcipcwd_card_init,
831         .remove         = __devexit_p(pcipcwd_card_exit),
832 };
833
834 static int __init pcipcwd_init_module(void)
835 {
836         spin_lock_init(&pcipcwd_private.io_lock);
837
838         return pci_register_driver(&pcipcwd_driver);
839 }
840
841 static void __exit pcipcwd_cleanup_module(void)
842 {
843         pci_unregister_driver(&pcipcwd_driver);
844
845         printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
846 }
847
848 module_init(pcipcwd_init_module);
849 module_exit(pcipcwd_cleanup_module);
850
851 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
852 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
853 MODULE_LICENSE("GPL");
854 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
855 MODULE_ALIAS_MISCDEV(TEMP_MINOR);